Davidson Defense Rebellion 18-inch AR-15 .450 Bushmaster Rifle Upper Build Kit

The Rebellion 18-inch AR-15 .450 Bushmaster Rifle Upper Build Kit from Davidson Defense is engineered for firearm enthusiasts who value performance and reliability. Chambered in .450 Bushmaster, this upper features an 18-inch H-BAR profile barrel made from durable 4150 Chrome Moly Vanadium (CMV) steel, with a 1:24 twist rate and a phosphate finish for corrosion resistance. The stripped upper receiver is constructed from 7075-T6 forged aluminum and is finished in anodized black, compatible with large ejection ports. This build kit includes a lightweight M-Lok handguard made from aircraft-grade 6061-T6 aluminum, designed for optimal versatility and attachment of accessories. The mid-length gas system ensures smoother operation, paired with a Recoil Technologies micro low-profile gas block and a KAK .458 compensator to manage muzzle rise. With a 5/8x32 thread pitch, this upper build kit is tailored for gunsmiths who appreciate functional freedom in their firearms.